Improvement in machines for bending wood



W, BRiGGS.

Machine for Bending Wood.

Patented June 29,1875.

No. |64.90l

THE GRAPHIC C(LPH 0T0 .-L|TH.39 & 41 PARK PLAGEJLY.

UNITED STATES PATENT OFFICE WIILLIAM BRIGGS, OF ASHBURNHAM,MASSACHUSETTS, ASSIGNOB TO GEORGE O. WINCHESTER, OF SAME PLACE.

IMPROVEMENT IN MACHINES FOR BENDING WOOD.

Specification forming part of Ltt6f5 Patent No. 1 64,901, dated June 29,1875; application filed April 6, 1875.

To all whom it may concern:

Be it known that I, WILLIAM Barees, of Ashburnham, in the county ofWorcester, State of Massachusetts, have invented a certain new anduseful Improvement in Machines for Bending Wood, of 'which the followingis a description sufficiently full, clear, and exact to enable anyperson skilled in the art or sciience to which my invention appertainsto make and use the same, reference being had to the accompanyingdrawing forming a part of this specification, in which a Figure 1 is anisometrical perspective view of my improvement; and Fig. 2 a view of thechuck.

Like letters of reference indicate corresponding parts in the differentfigures of the drawlug.

My invention relates more especially to that class of wood-bendin gmachines which are employed in the manufacture of chairs; and consistsin a novel construction and arrangement of the parts, as hereinaftermore fully set forth and claimed.

The nature and operation of my improvement will be readily understood byall conversant with such matters from the following description.

In the drawing, A A represent the standards or end pieces of theframe-work, which are connected by the cross beams or bars B B. Ahorizontal shaft, E, is journaled in the standards A A, carrying at oneof its ends the gear H and the fast and loose pulleys F G. Disposed inthe upper section of the machine, in the boxes Q, S, there are twoshafts, O D, connected by the gears J K, the shaft D being also providedwith the gearI, which intersects with the gear H of the shaft E.Arranged upon the outer end of the shaft 0 there is a cam, L, and, uponthe corresponding outer end ofthe shaft D, a chnclcholder or face-plate,M. A former, N, of peculiar formation is fitted upon the holder M, andkept from slipping or revolving thereon by means of splines 0 O, whichfit into corresponding grooves in plate M. Upon the outer edge of theformer there is a projection, V, which is hollow, or has opening intoone of its sides the socket X, a tapering rib or flange, W, extendingfrom the side of the projection opposite the socket entirely around theformer, which is irregular in shape, to correspond with the work themachine is designed to perform. The cam L is also irregular, itsperiphery conforming reversely with the former N-that is to say, wherethe surface of the former projects the surface of the cam is depressed,and vice versa.

In the use of my improved machine the bar or hoop P to be bent is firstproperly steamed, and one of its ends inserted in the socket X, its bodyresting in a slot in the bracket T. Power is then applied to the shaftE, causing the shafts O D to rotate, and the hoop to be wound round theformer N in contact with the flange W, the cam L being pressed firmlyupon the hoop during the operation by means of the springs B. When theformer has made a complete revolution the clamp U is passed over theformer and hoop, as shown in Fig. 2, and the former is then removed fromthe machine, the hoop being allowed to remain on the former until itsets or becomes fixed in its shape.

The cam L is provided with a notch, Z, into which the projection V fallsas the cam and former revolve oonjointly.

, It will be understood that each machine is designed to be fitted witha series of formers corresponding with the work for which it isintended.

Having thus explained my invention, what I claim -is- I In a wood-bending machine substantially such as described, the former N, provided withthe socket X and tapering flange W, combined to operate with the cam L,shafts O D, and plate M, substantially as and for the purpose set forth.

a WILLIAM BRIGGS. [1,. s]

Witnesses:

G. T. FIsH, DANIEL F. REAGAN.

